FlowLayoutpanel Reload

Question

In my form I use Flowlayoutpanel to contain 10 picture .By clicking on button i want Reload new picture over the old pic with out removing the old pic.

The   Flowlayoutpanel contain 10 panel's and in each panel the is lable and pic.How can I Select panel and reload pic in this panel.from same resone foreach control does not work.

it dosent find all the panel